# Functions
Try to dial all the ip address one by one if addr is a domain name, util one is successed.
Return all the ipv4 address for the domain name.
Return all the ipv6 address for the domain name.
Return all the ipv6 and ipv4 address for the domain name.
# Variables
default timeout, 300ms */.
default dns server */.
dial timeout */.
dns server to use */.